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diffusional kurtosis imaging: a promising technique for detecting microstructural changes in neural development and regeneration

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Neural Regeneration Research 2014年第11期9卷 1108-1109页

作者： Amir Paydar Center for Biomedical imaging Department of Radiology New York University School of Medicine 660 First Ave4th Floor New York NY USA

Brain development is one of the most fascinating subjects in the field of biological sciences. Nonetheless, our scientific commu- nity still faces challenges in trying to understand the concepts that define the underlying mechanisms of neural tissue devel- opment. After all, it is a very complex subject to grasp and many of the processes that take place during central nervous system maturation are yet to be ascertained. Despite this challenge, we have come to recognize that understanding the natural course of normal brain tissue development on both microscopic and macroscopic scales is the key to deciphering the mechanisms through which these neural networks also heal and regenerate. Realizing this concept, my good friend and colleague, Dr. Sar- ah Milla, and I decided to take on a human study to investigate brain maturation using non-invasive imaging techniques in the pediatric population at New York University （NYU） School of Medicine （Paydar et al., 2013）. Our research subjects included 59 normal infants with an age spectrum ranging from birth to approximately 5 years of age, when the brain is in its most active stage of development. We implemented a Magnetic Resonance imaging （MRI） diffusion technique called diffusional kurtosis imaging （DKI） to investigate the microstructural changes that occur in both the white matter （WM） and gray matter （GM） in the developing brain.

关键词： diffusional kurtosis imaging

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Classification of Intervertebral Disc Degeneration in Low Back Pain Using diffusional kurtosis imaging

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Open Journal of Radiology 2020年第2期10卷 79-89页

作者： Hiromitsu Takano Ikuho Yonezawa Takatoshi Okuda Kazuo Kaneko Department of Orthopedic Surgery Koto Hospital Tokyo Japan Department of Orthopedic Surgery School of Medicine Juntendo University Tokyo Japan Department of Spine Surgery Sangubashi Spine Surgery Hospital Tokyo Japan

Degenerative disc disease is the most common cause of low back pain. Intervertebral disc abnormalities are commonly evaluated by magnetic resonance imaging (MRI), and Pfirrmann’s system involves the use of T2-weighted images (T2WI) to classify disc degeneration. However, as this classification is based on visual evaluation, it is not possible to quantify degeneration using this method. The present study was performed to establish an MRI-based intervertebral disc classification system using diffusional kurtosis imaging (DKI), to quantify intervertebral disc water content according to the Pfirrmann classification. Sagittal mean diffusional kurtosis (MK) mapping was performed for the L3/4, L4/5, and L5/S1 intervertebral discs in 32 patients (15 female, 17 male;age range, 24 - 82 years;mean age, 57.7 years). The degree of disc degeneration was assessed in the midsagittal section on T2WI according to the Pfirrmann classification (grade I - V). The relationships between MK values, which are correlated with intervertebral disc composition changes, and grade of degeneration determined using the Pfirrmann classification were analyzed. The MK values tended to decrease with increasing grade of degeneration, and differed significantly between grades I and IV, but not between grade IV and V (P < 0.05, Mann-Whitney U test). DKI is an effective means of detecting the early stages of disc degeneration. Therefore, DKI may be a useful diagnostic tool for quantitative assessment of intervertebral disc degeneration.

关键词： diffusional kurtosis imaging Pfirrmann Classification Mean diffusional kurtosis Intervertebral Disc Degeneration Low Back Pain

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Advanced diffusion magnetic resonance imaging in patients with Alzheimer’s and Parkinson’s diseases

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Neural Regeneration Research 2020年第9期15卷 1590-1600页

作者： Koji Kamagata Christina Andica Taku Hatano Takashi Ogawa Haruka Takeshige-Amano Kotaro Ogaki Toshiaki Akashi Akifumi Hagiwara Shohei Fujita Shigeki Aoki Department of Radiology Juntendo University Graduate School of MedicineTokyoJapan Department of Neurology Juntendo University School of MedicineTokyoJapan

The prevalence of neurodegenerative diseases is increasing as human longevity increases. The objective biomarkers that enable the staging and early diagnosis of neurodegenerative diseases are eagerly anticipated. It has recently become possible to determine pathological changes in the brain without autopsy with the advancement of diffusion magnetic resonance imaging techniques. Diffusion magnetic resonance imaging is a robust tool used to evaluate brain microstructural complexity and integrity, axonal order, density, and myelination via the micron-scale displacement of water molecules diffusing in tissues. Diffusion tensor imaging, a type of diffusion magnetic resonance imaging technique is widely utilized in clinical and research settings;however, it has several limitations. To overcome these limitations, cutting-edge diffusion magnetic resonance imaging techniques, such as diffusional kurtosis imaging, neurite orientation dispersion and density imaging, and free water imaging, have been recently proposed and applied to evaluate the pathology of neurodegenerative diseases. This review focused on the main applications, findings, and future directions of advanced diffusion magnetic resonance imaging techniques in patients with Alzheimer's and Parkinson's diseases, the first and second most common neurodegenerative diseases, respectively.

关键词： Alzheimer's disease biomarkers diffusional kurtosis imaging disease progression early diagnosis free-water imaging neurites neurite orientation dispersion and density imaging Parkinson's disease

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